I am beginning to assemble my 300B monoblock amps. The transistors for the V-9 filament regulators are to be mounted on this 3/8" thick copper bar. I'm wondering if I should sandwich them down with a bar of copper or aluminum similar to what's there or just bolt them down with the mounting holes and #4 Keps nuts and or belvedere washers? I was considering bridging the two on the bar. The reason for the two different regs is so I can run either a 2.5V or 5V heated tube as I have some EMLs of both.
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